class Student:
    def __init__(self, id, name, age, score):
        self.id = id
        self.name = name
        self.__age = age
        self.score = score

    def A(self):
        return self.id

    def B(self):
        return self.name

    def C(self):
        return self.__age

    def D(self):
        return self.score

student = Student('S01', 'Alice', 20, 88)
print("学号:", student.A())
print("姓名:", student.B())
print("年龄:", student.C())
print("分数:", student.D())